Which of the following is not considered a fundamental particle?
A) an electron
B) an up quark
C) a neutrino
D) a proton
D
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Eta Carinae is an example of a
A) black hole. B) supermassive star. C) red dwarf. D) nebula. E) stellar nursery.
A He-Ne laser (632.8 nm) is used to calibrate a grating. If the first-order maximum occurs at 20.5°, what is the grating constant (the distance between the slits)?
A) 0.905 ?m B) 1.81 ?m C) 2.20 ?m D) 3.62 ?m E) 4.52 ?m
A convex lens has focal length f. If an object is placed at a distance beyond 2f from the lens on the principal axis, the image is located at a distance from the lens
A) of 2f. B) between f and 2f. C) of f. D) between the lens and f. E) of infinity.
A boy kicks a football with a certain initial velocity at an angle 20° above the horizontal. In 2.0 seconds, the ball reaches at its highest point in its trajectory. What is the initial velocity of the ball?
A) 9.8 m/s B) 20 m/s C) 57 m/s D) 4.9 m/s E) 29 m/s